I doubt the nano would work very well with a 6' tank. You could ask Roger Vitko to be sure.
I actually run a Wavebox with an external Herbie overflow on the opposite end. After much experimentation I found that the best way to keep the overflow silent is to have the overflow filled to the top of the emergency drain with just a trickle of water going down the emergency drain. If the water level is any lower the waves that the wavebox creates makes a lot of noise as they constantly wash over the edge and down into the overflow.
Tunze actually recommends a center overflow with a wavebox to minimize the effect of the waves on the draining action of the overflow.
If you were to go with the vortech, it would look even uglier than the wavebox if you had to put it on the exposed end of the tank because of the wires hanging on the OUTSIDE of the tank.
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